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Port Buffering

Overview

The Port Buffering feature allows data activity on the IOLAN’s serial ports to be held in memory for

viewing at a later stage without affecting the normal operation of the serial ports.

Functionality

Port Buffering is required by system administrators to capture important information from devices

attached to the IOLAN. If a device (such as a Router) has a problem and sends a warning message

out of its console port while no one is connected, the warning can be lost. With

Port Buffering

enabled, the messages will be captured in memory or in a file and can be viewed later to aid

administrators in diagnosing and fixing problems.

Local Port Buffering

Port buffer information for the serial port can be viewed after successful connection to a device on a

serial port. The user can toggle between communicating to the device on the serial port and viewing

the port buffer data for that device by entering a the

View Buffer String (default ~view). Local port

buffering is limited to 256Kb and will be flushed after the IOLAN reboots.

To view the local port buffer for a particular serial port, you must:

1. Connect to the device on that serial port by Telnet or SSH (the serial port(s) must be set to the

Console Management profile to support this type of connection).

2. Once you have established a connection to a device, you can enter the View Buffer String at any

time to switch the display to the content of the port buffer for that particular serial port.

3. To return to communicating to the device, press the ESC key and the communication session will

continue from where you left off.

To navigate through the port buffer data, the following chart illustrates the keyboard keys or “hot

keys” that can be used to view the port buffer data. Press the

ESC key and to continue to

communicate with the device on that particular serial port.

Note:

Port Buffering is only supported on serial port(s) configured for the Console Management

profile.

Keyboard Buttons Hot Keys Direction

Page Up <CTRL>B Up

Page Down <CTRL>F Down

Home <CTRL>T Top of the buffer data (oldest data)

End <CTRL>E Bottom of the buffer (latest data)

ESC Exit viewing port buffer data.

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Perle Systems Sds4 Manuel d'utilisateur Page 206